Resources Contact Us Home
Holographic digital watermark

Image Number 5 for United States Patent #7551750.

A digital watermark which is incorporated, perceptibly or imperceptibly, into a diffractive device such as a hologram. When applied to protect and/or authenticate a document of value or a product, the device provides an increased degree of overt and covert security, and permits tracking of the sale, use or other parameters associated with the product and/or document of value.

  Recently Added Patents
Flow cytometer method and apparatus
High gradient lens for charged particle beam
Schottky diode and method of manufacture
Vehicle having power supply apparatus
Round carrying case
Sheet coil type resolver
Phase noise extraction apparatus and technique
  Randomly Featured Patents
Video navigation
Infinitely variable focal power lens units precisely matched to varying distances by radar and electronics
Adaptive apparatus
Method of handling mobility in multimedia broadcast multicast service single frequency network in a wireless communication system and related communication device
Automatic voice dialer
Spear point for fishing spear guns
Mixing apparatus and method
Electromigration testing and evaluation apparatus and methods
Light dispersive optical fiber
Carbonate and hydroxy carbamate functionalized silicones